<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
        /* call(thisObj改变this对象,params传递的参数) */
        function sayName(label){
            console.log(label+":"+this.name)
        }
        var name="window";
        var cheng={
            name:"cheng"
        }
        var wang={
            name:"wang"
        }
        sayName("window")    //window:window
        sayName.call(cheng,"男孩子")    //男孩子：cheng
        sayName.call(wang,"女孩子")     //女孩子:wang
    </script>
</body>
</html>